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Electronic Communication Systems 2nd Edition by Roy Blake
Edition 2ISBN: 978-0766826847Electronic Communication Systems 2nd Edition by Roy Blake
Edition 2ISBN: 978-0766826847 Exercise 2
(a) The signal voltage at the input of an amplifie is 100 µV, and the noise voltage is 2 µV. What is the signal-to-noise ratio in decibels
(b) The signal-to-noise ratio at the output of the same amplifier is 30 dB. What is the noise figure of the amplifier
(b) The signal-to-noise ratio at the output of the same amplifier is 30 dB. What is the noise figure of the amplifier
Explanation
Verified
Verified
(a)
The expression for the signal-to-noise ratio at the input of the amplifier is,
Substitute
for
, and
for
.
Therefore, the signal-to-noise ratio value is
(b)
The noise figure of the amplifier calculation:
…… (1)
Here,
is the signal-to-noise ratio at input of the amplifier,
is the signal-to-noise ratio at output of the amplifier,
is the noise figure of the amplifier.
Substitute
for
, and
for
in equation (1).
Therefore, the noise figure value is
The expression for the signal-to-noise ratio at the input of the amplifier is,
Substitute for , and for . Therefore, the signal-to-noise ratio value is (b)The noise figure of the amplifier calculation:
…… (1)Here,
is the signal-to-noise ratio at input of the amplifier, is the signal-to-noise ratio at output of the amplifier, is the noise figure of the amplifier.Substitute
for , and for in equation (1). Therefore, the noise figure value is 
Electronic Communication Systems 2nd Edition by Roy Blake
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